From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 21 Jun 2015 19:00:30 +0000 (+0200)
Subject: m68k/psc: Fix race in installing chained IRQ handler
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=09c5cb942f7545e53819ee2ca72fe843d23880e5;p=linux-beck.git

m68k/psc: Fix race in installing chained IRQ handler

Fix a race where a pending interrupt could be received and the handler
called before the handler's data has been setup, by converting to
irq_set_chained_handler_and_data().

Search and conversion was done with coccinelle:

@@
expression E1, E2, E3;
@@
(
-if (irq_set_chained_handler(E1, E3) != 0)
-   BUG();
|
-irq_set_chained_handler(E1, E3);
)
-irq_set_handler_data(E1, E2);
+irq_set_chained_handler_and_data(E1, E3, E2);

@@
expression E1, E2, E3;
@@
(
-if (irq_set_chained_handler(E1, E3) != 0)
-   BUG();
...
|
-irq_set_chained_handler(E1, E3);
...
)
-irq_set_handler_data(E1, E2);
+irq_set_chained_handler_and_data(E1, E3, E2);

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Joshua Thompson <funaho@jurai.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
---

diff --git a/arch/m68k/mac/psc.c b/arch/m68k/mac/psc.c
index 835fa04511c8..272dde481d17 100644
--- a/arch/m68k/mac/psc.c
+++ b/arch/m68k/mac/psc.c
@@ -148,14 +148,10 @@ static void psc_irq(unsigned int irq, struct irq_desc *desc)
 
 void __init psc_register_interrupts(void)
 {
-	irq_set_chained_handler(IRQ_AUTO_3, psc_irq);
-	irq_set_handler_data(IRQ_AUTO_3, (void *)0x30);
-	irq_set_chained_handler(IRQ_AUTO_4, psc_irq);
-	irq_set_handler_data(IRQ_AUTO_4, (void *)0x40);
-	irq_set_chained_handler(IRQ_AUTO_5, psc_irq);
-	irq_set_handler_data(IRQ_AUTO_5, (void *)0x50);
-	irq_set_chained_handler(IRQ_AUTO_6, psc_irq);
-	irq_set_handler_data(IRQ_AUTO_6, (void *)0x60);
+	irq_set_chained_handler_and_data(IRQ_AUTO_3, psc_irq, (void *)0x30);
+	irq_set_chained_handler_and_data(IRQ_AUTO_4, psc_irq, (void *)0x40);
+	irq_set_chained_handler_and_data(IRQ_AUTO_5, psc_irq, (void *)0x50);
+	irq_set_chained_handler_and_data(IRQ_AUTO_6, psc_irq, (void *)0x60);
 }
 
 void psc_irq_enable(int irq) {